1 /* params.c - Run-time parameters.
2 Copyright (C) 2001-2016 Free Software Foundation, Inc.
3 Written by Mark Mitchell <mark@codesourcery.com>.
4
5 This file is part of GCC.
6
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, or (at your option) any later
10 version.
11
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
20
21 #include "config.h"
22 #include "system.h"
23 #include "coretypes.h"
24 #include "common/common-target.h"
25 #include "params.h"
26 #include "params-enum.h"
27 #include "diagnostic-core.h"
28
29 /* An array containing the compiler parameters and their current
30 values. */
31
32 param_info *compiler_params;
33
34 /* The number of entries in the table. */
35 static size_t num_compiler_params;
36
37 /* Whether the parameters have all been initialized and had their
38 default values determined. */
39 static bool params_finished;
40
41 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX)
42 #define DEFPARAMENUM5(ENUM, OPTION, HELP, DEFAULT, V0, V1, V2, V3, V4) \
43 static const char *values_ ## ENUM [] = { #V0, #V1, #V2, #V3, #V4, NULL };
44 #include "params.def"
45 #undef DEFPARAMENUM5
46 #undef DEFPARAM
47
48 static const param_info lang_independent_params[] = {
49 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX) \
50 { OPTION, DEFAULT, MIN, MAX, HELP, NULL },
51 #define DEFPARAMENUM5(ENUM, OPTION, HELP, DEFAULT, \
52 V0, V1, V2, V3, V4) \
53 { OPTION, (int)ENUM ## _KIND_ ## DEFAULT, 0, 4, HELP, values_ ## ENUM },
54 #include "params.def"
55 #undef DEFPARAM
56 #undef DEFPARAMENUM5
57 { NULL, 0, 0, 0, NULL, NULL }
58 };
59
60 /* Add the N PARAMS to the current list of compiler parameters. */
61
62 void
add_params(const param_info params[],size_t n)63 add_params (const param_info params[], size_t n)
64 {
65 gcc_assert (!params_finished);
66
67 /* Allocate enough space for the new parameters. */
68 compiler_params = XRESIZEVEC (param_info, compiler_params,
69 num_compiler_params + n);
70 /* Copy them into the table. */
71 memcpy (compiler_params + num_compiler_params,
72 params,
73 n * sizeof (param_info));
74 /* Keep track of how many parameters we have. */
75 num_compiler_params += n;
76 }
77
78 /* Add all parameters and default values that can be set in both the
79 driver and the compiler proper. */
80
81 void
global_init_params(void)82 global_init_params (void)
83 {
84 gcc_assert (!params_finished);
85
86 add_params (lang_independent_params, LAST_PARAM);
87 targetm_common.option_default_params ();
88 }
89
90 /* Note that all parameters have been added and all default values
91 set. */
92
93 void
finish_params(void)94 finish_params (void)
95 {
96 params_finished = true;
97 }
98
99 /* Reset all state within params.c so that we can rerun the compiler
100 within the same process. For use by toplev::finalize. */
101
102 void
params_c_finalize(void)103 params_c_finalize (void)
104 {
105 XDELETEVEC (compiler_params);
106 compiler_params = NULL;
107 num_compiler_params = 0;
108 params_finished = false;
109 }
110
111 /* Set the value of the parameter given by NUM to VALUE in PARAMS and
112 PARAMS_SET. If EXPLICIT_P, this is being set by the user;
113 otherwise it is being set implicitly by the compiler. */
114
115 static void
set_param_value_internal(compiler_param num,int value,int * params,int * params_set,bool explicit_p)116 set_param_value_internal (compiler_param num, int value,
117 int *params, int *params_set,
118 bool explicit_p)
119 {
120 size_t i = (size_t) num;
121
122 gcc_assert (params_finished);
123
124 params[i] = value;
125 if (explicit_p)
126 params_set[i] = true;
127 }
128
129 /* Return true if it can find the matching entry for NAME in the parameter
130 table, and assign the entry index to INDEX. Return false otherwise. */
131
132 bool
find_param(const char * name,enum compiler_param * index)133 find_param (const char *name, enum compiler_param *index)
134 {
135 for (size_t i = 0; i < num_compiler_params; ++i)
136 if (strcmp (compiler_params[i].option, name) == 0)
137 {
138 *index = (enum compiler_param) i;
139 return true;
140 }
141
142 return false;
143 }
144
145 /* Return true if param with entry index INDEX should be defined using strings.
146 If so, return the value corresponding to VALUE_NAME in *VALUE_P. */
147
148 bool
param_string_value_p(enum compiler_param index,const char * value_name,int * value_p)149 param_string_value_p (enum compiler_param index, const char *value_name,
150 int *value_p)
151 {
152 param_info *entry = &compiler_params[(int) index];
153 if (entry->value_names == NULL)
154 return false;
155
156 *value_p = -1;
157
158 for (int i = 0; entry->value_names[i] != NULL; ++i)
159 if (strcmp (entry->value_names[i], value_name) == 0)
160 {
161 *value_p = i;
162 return true;
163 }
164
165 return true;
166 }
167
168 /* Set the VALUE associated with the parameter given by NAME in PARAMS
169 and PARAMS_SET. */
170
171 void
set_param_value(const char * name,int value,int * params,int * params_set)172 set_param_value (const char *name, int value,
173 int *params, int *params_set)
174 {
175 size_t i;
176
177 /* Make sure nobody tries to set a parameter to an invalid value. */
178 gcc_assert (value != INVALID_PARAM_VAL);
179
180 enum compiler_param index;
181 if (!find_param (name, &index))
182 {
183 /* If we didn't find this parameter, issue an error message. */
184 error ("invalid parameter %qs", name);
185 return;
186 }
187 i = (size_t)index;
188
189 if (value < compiler_params[i].min_value)
190 error ("minimum value of parameter %qs is %u",
191 compiler_params[i].option,
192 compiler_params[i].min_value);
193 else if (compiler_params[i].max_value > compiler_params[i].min_value
194 && value > compiler_params[i].max_value)
195 error ("maximum value of parameter %qs is %u",
196 compiler_params[i].option,
197 compiler_params[i].max_value);
198 else
199 set_param_value_internal ((compiler_param) i, value,
200 params, params_set, true);
201 }
202
203 /* Set the value of the parameter given by NUM to VALUE in PARAMS and
204 PARAMS_SET, implicitly, if it has not been set explicitly by the
205 user. */
206
207 void
maybe_set_param_value(compiler_param num,int value,int * params,int * params_set)208 maybe_set_param_value (compiler_param num, int value,
209 int *params, int *params_set)
210 {
211 if (!params_set[(int) num])
212 set_param_value_internal (num, value, params, params_set, false);
213 }
214
215 /* Set the default value of a parameter given by NUM to VALUE, before
216 option processing. */
217
218 void
set_default_param_value(compiler_param num,int value)219 set_default_param_value (compiler_param num, int value)
220 {
221 gcc_assert (!params_finished);
222
223 compiler_params[(int) num].default_value = value;
224 }
225
226 /* Return the default value of parameter NUM. */
227
228 int
default_param_value(compiler_param num)229 default_param_value (compiler_param num)
230 {
231 return compiler_params[(int) num].default_value;
232 }
233
234 /* Initialize an array PARAMS with default values of the
235 parameters. */
236
237 void
init_param_values(int * params)238 init_param_values (int *params)
239 {
240 size_t i;
241
242 gcc_assert (params_finished);
243
244 for (i = 0; i < num_compiler_params; i++)
245 params[i] = compiler_params[i].default_value;
246 }
247
248 /* Return the current value of num_compiler_params, for the benefit of
249 plugins that use parameters as features. */
250
251 size_t
get_num_compiler_params(void)252 get_num_compiler_params (void)
253 {
254 return num_compiler_params;
255 }
256